Considering luxury watches today are a 50 Billion CHF per annum business, 10% would be a healthier number than I would've projected. But what you say is possible! Imagine. If Rolex wanted to make "product X," they have the power to influence millions of people into starting a new trend. Simply because they have the clientele, the eye-balls, the distribution, and the number of stores spanned across the globe. If Rolex made a line of daily-use accessories, they would indeed sell thousands of these pieces every year. With 1500-2000 Rolex dealers worldwide, I'd imagine each dealer would be able to sell multiple pieces per annum.
Today, even a small designer company like Brunello Cucinelli influences fashion in certain resort towns across the world. Uniqlo, GAP, and other fashion labels with wide distribution heavily influence global fashion trends. Even people who don't consider themselves to be fashion oriented subconsciously are influenced. Even IKEA starts home fashion trends that influence home decor outside of the "small apartments" market segment IKEA is targeting.